As best I can tell, the most relevant scientific study on this question is Elizabeth Cauffman & Laurence Steinberg, (Im) maturity of Judgment in Adolescence: Why Adolescents May Be Less Culpable than Adults, 18 Behav.

So, for instance, if A shoplifts a candy bar, causing B to have his pay docked by her supervisor C, then I do think A is a little morally culpable for that harm - but a hell of a lot less than C, who acted directly on B, is.

= Manslaughter = or = Culpable Homicide = (Scotland) is the unlawful killing of a human being without malice -- as homicide after great provocation; signalman who allows a train to pass, and so collide with another in front.